# User

Understanding how to define and manage users is essential for executing more effective marketing actions with Hackle.

This guide provides a quick overview of Hackle's user concepts and how to use them — written for marketers.

### User Identification

Hackle identifies users based on unique identifiers and tracks their behavior.\
This allows you to accurately understand the behavioral flow of each individual user.

For a detailed explanation of user identifiers, refer to [User Identifier](/en/getting-started/user-identifier.md).

### User Properties

User Properties are specific pieces of information that each user has.\
By using these properties, you can segment customers more precisely and deliver personalized messages.

User Properties can be stored once at a specific point in time (e.g., sign-up date) or continuously updated (e.g., membership tier).

This information makes it possible to create specific target groups such as "female users in their 30s with VIP status."

**User Property Examples**

<table><thead><tr><th width="170.3671875">Category</th><th>Examples</th></tr></thead><tbody><tr><td>Demographic Information</td><td>Age, gender, region, etc.</td></tr><tr><td>Membership Information</td><td>Tier (e.g., VIP, Gold), membership join date</td></tr><tr><td>Service Usage Information</td><td>Average monthly purchase count, last visit date, initial sign-up date</td></tr></tbody></table>

### User Group (Cohort)

Based on user identifiers, properties, and events, you can create Cohorts that meet specific conditions.\
Cohorts become the core target for marketing campaigns.

You can design and run personalized campaigns — for example, running a Re-engagement Campaign targeting a churned user Cohort to encourage return visits, or offering exclusive benefits to high-value customers.

For a detailed explanation of cohorts, refer to [Cohort Introduction](/en/cohort/cohort.md).

**Cohort Creation Examples**

<table><thead><tr><th width="170.14453125">Category</th><th>Examples</th></tr></thead><tbody><tr><td>Churned Users</td><td>Users who have not visited within a specific period (e.g., the last 14 days)</td></tr><tr><td>High-Value Customers</td><td>Users who have purchased a specific product 3 or more times</td></tr><tr><td>Potential Customers</td><td>Users who have not yet converted to paid after a free trial ended</td></tr></tbody></table>


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